<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<script type="text/javascript">
			
			let age = 16;
			alert( age>=18 ? '成年人': '未成年'  );
			
		</script>
	</body>
</html>
